Cook the pasta in salted water till al dente. Drain and keep aside.
In a large wok or pan, heat olive oil and add sliced onion. Saute for one minute.
Add asparagus, broccoli, bell pepper and snow peas and sauté for another minute or two.
Add the cooked pasta, chilli flakes, dried herbs and season with salt and pepper. Stir fry on high heat for a minute.